Gauge



Sep; 2?

Rn BRADSTI'REET GAUGE Filed Deo. 22, 1922 INVENTOR.

ATTORNEY.

Passed sept. 27, 192.7. 1,643,4@4

UNITED STATES PATENT OFFICE.v

ROSS BRADSTREET, OF ST. CHARLES, IIITJIIWOIS.

GAUGE.

Application filedDeceinber 22, 1922. Serial No. 608,436.

My invention relates generally to improve` ments in gauges, but in some of its aspects relates more particularly to improvements in surface gauges.

e The general'object of my invention is to provide a surface gauge which can be very eadily combined with a scale and square.

Tt is also an object of my invention to provide a gauge which can be quiclly adjusted to desired position on the sca-le and whereby the scriber or pointer can be quickly, easily, and accurately brought into con- .act with the surface or object. In this connection l aim also to provide a construction whereby the .scriber can be movedinto place with one hand, preferably the left, so that the right hand will be free to adjust or position the work where such action is necessary.

il further object of my invention is to provide a construction ofthe above character in which practically all error due to lost motion shall be eliminated.

My invention consists generally in a gauge of the form, arrangement, construction and co-action of the various parts thereof wlierebv the above named objects, together with others that will appear hereinafter are attainable; and my invention will be more any other purpose. At the same time the construction has been such'tliat more than one hand is necessary to manipulate the gaugeV and even then considerable time is required accurately to4 position the scriber or finder in contact with the work.

Part of the equipment of almost every machinist consists of a square and a scale and I aim to provide means whereby the scale 'and square can be quickly and easily converted into a surface gauge. Thus, in Fig. 1, 1 represents a typical square in which there is positioned a typical steel scale 2. I have designated a device which bears, as a whole, the' referencecharacter 3 and whiclL is adapted to slide along the scale. To this end it is provided with overhanging ledge portions 4 and 5 Fig. 4, which form a slot or guideway 6 of a size adapted snugly to embrace the scale 2. For holding tliedevice 3 at any desired position on the scale 2 Ihave the block 8; Mounted for swinging movement on the bloclrS, as by-means of a pivot screw 9, is an arm 10 which, at its outer end, is provided with an upstanding pin 11 and which serves as a support for the holder 12 in which the scriber 13 is mounted. The holder 12 includes a split extension 12a' on lil "0 readily understood by reference to the acone side of which is a two part clamping companying drawings which illustrate what block 12D between the parts of which the I consider, at the present time, to be the scriber 13 is tightly, secured by a thumb nut preferred embodiment thereof. 12C. The constructionpist described is such ln said drawings: as to permit of a longitudinal adjustment Fig. 1 is a side elevation of a gauge en oofthe scriber as well as its angular position bodying my invention, the same being 1n with respect to the scale 2. condition for work. For the purpose of swinging the arm 10 it Fig. 2 is a side elevation or face view of is provided with a linger-like extension 14 the device which is adapted to slide upon which is arranged in the pathl of a screw 15,

the scale and to support a scriber. the end portion 16 o-f the screw contacting Fig. 8 is an end view of the device shown one side of the finger 14.. Upon the other in Fig. 2. side of the finger 14 there is positioned a Fig. 4 is a bottom edge view of the device spring 17 which constantly presses the finger shown in Fig. 2. 14 against the stem portion 16 of the screw Fig. 5 is a face view similar to Fig. 2, but 15. Thus, if the screw`15 is rotated in one illustrating a modified form of my invendirection, it will positively swing the arm tion. 10 downwardlyand if it is backed away the Fig. 6 is a fragmentary sectional view of arm 10 will be swung upwardly by virtue of still another modified construction embodythe spring 17. By this construction all lost ing my invention; and' motion in the screw is taken up and the Fig. 7 is a face View illustrating another construction embodying my invention.

In machine shop practice a surface gauge is required from time to time. Such gauges as heretofore constructed have usually consisted of devices which could not be used for arm, 10, can be quickly and easily swung in order to position the scriber as desired. It Should be obvious that the screw 15 can be manipulated with one hand, thus leaving the other hand free to position or adjust the work as is often necessary.

provided a set screw 7 whichvis threaded in The modified construction 'shown inl Fig. 5 is similar to that already described and corresponding parts have been given`corresponding reference characters. Instead of providing a coil spring, however, a Hat spring 18 is provided which is iixed at one end in the block 8 and at the other end in the arm 10. The spring 18 broadly functions the same as the spring 17. y

In the modification shown in Fig. 6 a flat spring 19 passes through the pivot screwA 9, and obviously rotation thereof is resisted by the spring 19. In this construction the pivot pin 9 and the arm 10 are fixed to rotate or swing together.

In Fig. 7 I have illustrated a modilication wherein there is provided a block 2O which `is provided with a slotfway 21 of a size adapted to slidablyembrace the scale 2. 22 is a set screw for fixing the `block upon the scale. Carried by the block `2O is a pivot pin or stud'QS which corresponds quite generally to the stud 11 referred to in the rprevious `iiguresand is adapted toreceive the device 12 in which the scriber 13 is mounted. Thus movement of the Vportion 23 would cause movement of the scriber. For the purpose of eiecting such move ment the portion 23 has aportion 24; which extends into the bodyoi the block 2Q and which is `provided with an extension portion 25 that is screw threaded. Mounted on the screw threaded portion 25 is anut 26 which is mounted in a slot 27 inthe block 20, so that it mayrotate but cannot move axially of the screw portion 25. The screw portion 25 is prevented from turningby means of a pin 28 which extends intoa slot 29 provided in the face of the integral. portioni. Thus rotary movement of the nut 26 in one direction pushes theportion 23 outwardly and rotation in the opposite .direction retracts it.

',Interposed between the portion 24 and the nut 26 is a helical spring 30 which takesup all lost motion of the screw and thereby en- V ables the accurate operation of the device. T

It will be observedthat in all of the forms ing blade andhaving a tubular housing at oneA end, a screw threaded through one edge of the block for securing the same to the blade,`

means pivotally mounted onone side of the bloclr and having an arml normally arranged in saidhousing and having a second arm extending `beyond that edge ofthe block opposite the rst mentioned edge and including a pin, 2a scriber holding means adaptedto be secured upon said pin, Van actuating screw y in saidhousmg parallel with said set screw and engaging said -iirst mentioned arm eX-` tending into said housing, and a spring acting on said pivotally mounted means in opposition to said actuating screw.

, 2. `A deviceof the kind described embody7n ing therein a block adapted tobe operatively engaged on a supporting blade and having` a housing at onev end, a set screw threaded through one edge of the `block i'or locking.

it to said blade, abell crank member pivoted on the side of said block and having one arm extending into said housing and having its other arm extending beyond the adjacent edge of said blockand blade and provided with a pin, a scriberholding means adapted to be clamped to said pin,l an actuating screw threaded into thehousing *above` and parallel with said set screw and engaging with one side` o'fsaid `operative crank arm extendinginto said housing, and a spring in said mounting and engaging the opposite side of said bell crank arm.

In testimony whereof, I have hereunto set my hand, this 29th day of November, 1922. `Ross Bininsfrannr. 

